Make main.Connection and base.locate available in the top-level namespace.
Added utils.common_url_prefix and moved to args_to_kwargs to utils.py where it belongs.
Transport now accepts root URLs and allows optionally to rewrite absolute URLs to use the stored root.
minissdp: Remove redundant code, improve error messages and allow just resources to be returned by "search" (rather than tuples).
Remove debug code in main.py.
Added locate functions adapted Connection class to be location focused rather than host/port focused.